Table 6: Results of ANOVA.

SourceDFSSMS 𝐹 % contribution

A210.0055.0021.81*13.8
B21.3280.6640.241.8
C21.7630.8810.322.5
D23.5231.7610.644.9
A * B418.4814.621.6725.6
A * C412.9383.2351.1717.9
B * C47.6191.9050.6910.5
Error616.572.76223
Total2672.227

*Significant at 75% confidence level 𝐹 0 . 2 5 , 2 , 6 = 1 . 7 6 .